Control means for fluid pressure motors



lOct. 8, 1,946. J. F. McGLONE 2,408,795

-coru'nor. mms FoR FLUID PRESSURE uoToRs Fild Harsh 22, 1944 2 sheets-sheet 1 oct. 8,'1946.

.1.V F. McGLoNE I 'CONTROL MEANS FOR FLUID PRESSURE Mo'roRs- 2 vSheets-Sheet 2 Filed March 22, 1944 Inventor* dba/v E' MSGLONE.

9 O QAM. www ffmm Patented Oct. y8, i946 Y 52,408,795 I i I y' fooN'rRon MEANS FOR rtm1) reirse-Unir4 f vMo'rons Y `.reims F. Meolone, saniego, Calif.

`Application March 22, 1941i,V Serial No. 527,563

' This invention relates to reciprocating fluid pressure motors and has rfor one of yitsimportant objects the provision of a means for c ontrolling and regulating lthe extent of movement of the power piston of such a motor, Q

Another object is to provide a simple and enicientV means, wherebythe stroke of the power piston of a fluid pressure motor may be positively controlled and regulated.

Another object is to provide a control means of the above kind that may be readily rendered inoperative for allowing the power piston to operate with its normal full stroke.

These and other objects will appear from the following specication, when considered in connection with the accompanying drawings, in which: i

Figure l is a View in side elevation, illustrating a lluid pressure motor provided with a stroke controlling and regulating means embodying the present invention.

Figure 2 is a vertical section taken on the line 2-2 of Figure 1.

Figure 3 is a perspective view of the control piston valve.

Figure 4 is a perspective view of the adjusting lever for the control piston valve.

Figure 5 is an enlarged view, partly in section on line 5-5 of Figure 2.

Referring in detail to the drawings, the numeral I indicates a base having a standard 2 on which is mounted a control cylinder 3, Positioned above the control cylinder is a work cylinder I mounted on another standard 5, and having therein a power piston 6. The piston B has the usual piston rod 1 attached thereto, said rod extending through a gland 8 in-one of the cylinder heads 9. Leading into opposite ends of the cylinder 4 are the conduits I0 and I I, respectively. Also leading from the opposite ends ofthe cylinder 4 are the outlet conduits l2 and I3, respectively. Y

The outlet conduits, I2 and I3, communicate with the control cylinder 3 intermediate the ends of the latter, and movable in cylinder 3 is an elongated control piston valve I5, having a piston rod I6 that extends through a gland I1 in one of the heads I8 of cylinder 3.

Control piston valve I5 is longer than the full stroke of power piston 6, and has a longitudinal groove I9 therein that extends diagonally across one side of its cylindrical surface.

Communicating with opposite ends of the control cylinder 3 are outlet conduits 20 and 2|, re-

reservoir, I not rod 22. .This rod is rigidlysecured. at v23 to the connecting rod v'I and .has its Vopposite end bifurcated or forked to fit'voveracollar 25` between.

its shoulders 25 and 2l, thus permitting' the connecting rod IS to rotate relative to rod 22.

The outer end of the rod 22 is square and receives thereon a sleeve 28 having a crank 29 provided with a handle 3U. The sleeve 28 has a square bore in order to snugly t over the square portion of the rod I6, and in the crank 29 is an aperture 32 through which a bolt 33 passes. Bolt 33 receives a wing nut 34 which, when tightened, will hold the crank rmly against movement, the bolt 33 passing through a slot 36 of a graduated arcuate gauge bar 35.

The operation of the motor and control means therefor is as follows:

Assuming the parts are in the positions illustrated in Figure 5, but with the piston valve I5 turned so that its groove I9 does not register with conduits I2 and I3, the conduit IIJ will act as an intake, supplying the fluid pressure to the forward side of the piston 6 for moving it rearwardly to the position shown by the dotted lines'. During this stroke the conduit II acts as an outlet. By reversing the ow of the fluid, as indicated by the dotted arrows, the piston 6 will be moved back to its original position, and during this stroke the conduit II is the intake and conduit I0 the outlet. The conduits III and II are connected to any preferred type of selector valve.

While the above action is taking place, the blank or ungrooved portion of the face of the piston valve I5 is presented to the lower ends of the conduits I2 and I3, thereby, rendering the control means inoperative. As long as this blank portion is maintained in the named position, the motor would perform in its usual manner.

If, for example, it is desired to utilize one-half of the full stroke of the work piston 6, the handle 30 should be moved in an arc of 90 degrees, thus giving a one-quarter turn to the piston valve I5 and thereby moving half of the groove I9 out of the path of the conduit I2. In this position, the groove I9 will not cooperate with the conduit I2 to release the pressure within the power cylinder 4, until the piston valve I5 has been moved onehalf its length, at which point the groove I9 and the outlet conduit I2 will come into alignment for releasing pressure in the work cylinder 4 through the groove I9 and conduit 20 to the stor age tank or reservoir.

As the two piston rods 'I and I6 are connected by the rod 22 they will move in unison, and therefore when the operative point of the groove I9 cooperates with the outlet I2 the work piston B wi11 have moved one-half of its stroke and will stop at this point. It will be seen that the degree of turning of the piston I5 will determine when the groove I9 and outlet I2 will register, thereby enabling the operator to control the length of the stroke of the piston 6 to any degree desired. The same operation can be had for movementA of piston 6 in the opposite direction, at which time the registration of groove I9 with conduit I3 is controlled.

When the control piston valve has been rotated to the desired position, accidental turning thereof may be avoided by tightening the wing nut 34.

By referring t0 Figure 3 the outlet end 50 of groove I9 can be seen as extending all the way to this end of the piston valve I5. The groove I9 does not extend all the way to the opposite end of the piston valve, thus providing the ungrooved end portion 5I which will prevent discharge of the fluid, behind the piston valve I5. Any slight seepage behind piston valve I5 Will be drained by theV conduit 2 I.

Having described the invention, what is claimed as new is:

In combination, a double-acting uid pressure motor comprising a power cylinder having a power piston therein, a rod connected to said power piston and extending through one end of said power cylinder, a pipe for the inlet or outlet of pressure fluid at each end of said power cylinder, and means to vary the stroke of said power piston including a control cylinder, a rotatably adjustable elongated control piston valve reciprocable in said control cylinder, means connecting said control piston valve to the power piston for travel therewith in the same direction, said control piston valve having a longitudinal diagonally disposed groove therein, said groove being closed at one end of the control piston valve and open at the other end thereof, exhaust conduits connecting the ends of the power cylinder with the intermediate portion of the control cylinder, and means to rotatably adjust said control piston Valve to` vary the point of registry of the exhaust conduits with said groove, said control cylinder having a vent at one end and a fluid outlet at the other end in constant communication with the open end of said groove.

JOHN F. MCGLONE. 

